This is my preferred pattern. It takes a bit
more practice, but looks like the ones I used to get when I was little.
A palm frond about 1/4 inch wide and 13 inches long will make an average
size cross.

1. Hold the frond horizontally

2. Bend the right end straight up from the centre to form a right angle.

3. Fold this same top strip, from the centre,
back and down, up and over again, to form a square at the back. It will
still be a right angle at this point.

4. a) Bring the left strip forward and fold over the centre towards the right.
b) Fold away from you and pull through the square at back, all the way.

5. Bend the top strip forward and put the end
through the centre square to make a shaft of desired length.

6. Fold left hand strip backwards and put through
the back square. This makes the left crossbar and should be in proportion
to the shaft.

7. Fold the right strip back, put through the back square and fasten.

Pattern #2:

This one is probably much easier, particularly
when teaching children

1. Take a palm frond about 1/2 inch wide and 13 inches and hold upright

2. Fold the top down, away from you, and the bottom up, away from you,
to form the shaft of a cross of desired length

3. Turn the end down and twist around to the right and across the front
of the shaft to make a crossbar in proportion to the length.

4. Fold the end around behind the shaft.

5. Bring the end from behind, under the centre. Fold from the bottom
right to the top left and under again from the bottom left to the
top right.